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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 9,119	$ 4,857
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	298	183
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	32,122	36,678
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,776	5,370
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	41,241	41,535
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	5,074	5,553
Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	8,714	4,562
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	282	147
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	31,475	35,764
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,661	5,186
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	40,189	40,326
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	4,943	5,333
Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	405	295
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	16	36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	647	914
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	115	184
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,052	1,209
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	131	220
Corporate Debt Securities [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	3,871	2,134
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	71	70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	21,471	24,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,036	3,524
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	25,342	26,341
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	3,107	3,594
Corporate Debt Securities [Member] | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	392	295
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	14	36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	413	649
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	62	121
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	805	944
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	76	157
Canadian and Canadian provincial governments | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	159	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	432	459
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	35	33
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	591	459
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	41	33
Residential mortgage-backed securities | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	636	681
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	76	99
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	636	796
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	76	102
Asset-backed Securities [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,054	336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	22	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,039	3,025
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	148	223
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	3,093	3,361
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	170	228
Asset-backed Securities [Member] | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	13	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	44	68
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5	10
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	57	68
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	7	10
Commercial mortgage-backed securities | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	188	160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	12	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,156	1,328
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	96	190
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,344	1,488
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	108	195
Commercial mortgage-backed securities | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	1
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	0	4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	1
US Government Agencies Debt Securities [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	264	614
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	711	717
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	210	204
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	975	1,331
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	212	214
US States and Political Subdivisions Debt Securities [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	73
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	532	864
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	81	128
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	532	937
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	81	129
Debt Security, Government, Non-US [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	770	254
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	10	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,009	2,290
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	302	333
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2,779	2,544
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	312	336
Debt Security, Government, Non-US [Member] | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	190	193
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	48	52
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	190	193
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	48	52
JAPAN | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	2,408	876
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	159	50
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,489	2,193
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	677	452
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	4,897	3,069
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 836	$ 502

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